Film holder



March i6, 1937. G. A. MAGNUS ET Al. 2,073,644

l FILM HOLDER Filed Aug. 27, 1934 2 Sheets-Sheetnl Fws.

Mam 13.6, 1937. G, A. MAGNUSET AL 2,073,644'

FILM HOLDER Filed Ag. 27, 1954 2 Sheets-Sheet 2 Z4 /N VEA( T025 l? /4 Trae/vins `Patented Mar. 16, 1937 UNITED STATES PATENT CFFICE FILM HOLDER Application August 27, 1934, Serial No. 741.654

8 Claims.

(Granted under the act of March 3, 1883. as

amended April 30,

The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to us of any royalty thereon.

,, The present invention relates generally to film holders for moving picture films and the primary object is to provide a spirally arranged web upon supports consisting of radial arms which hold the convolutions of the spirally woven web in such 1o spaced relation to one another as to permit the reception of a moving picture film therebetween. the spaces between the convolutions of the film being practically unobstructed so that the leveloping, fixing and washing iiuids will be readily 1.', accessible to the emulsion side of the film. By providing a spirally arranged web in a structure of this character. the film may be wound in a minimum amount of space in such a manner as to permit the holder and film being immersed in the developing fiuids to obtain uniform developmentof the film.

Another object of the present invention is to provide improved means for positioning and holding the convolutions of the spirally wound web '.5 in spaced relationship with respect to the radial arms constituting a means of support for the same.

In the accompanying drawings: Fig. 1 is a top plan elevation of a film holder constructed in accordance with the invention;

Fig. 2 is a fragmentary enlarged side elevation of Fig. 1;

Fig. 3 is a sectional view taken on the line 3-3 of Fig. 1;

Fig. 4 is a sectional view taken on the line 4--4 of Fig. 1;

Fig. 5 is a perspective view upon an enlarged scale of a portion of one of the radial arms;

Fig. 6 is a bottom view of Fig. 5 illustrating the manner of securing the convolutions of the web to the radial arm; and

Fig. 7 is a perspective view of a portion of one of the radial arms illustrating the spaced reinforcing portions thereof.

Referring more particularly to the drawings wherein corresponding parts are designated by like numerals throughout the several views thereof, the improved film holder of the present invention comprises generally a frame made of a plurality of radial arms I0, which are secured at their inner ends to a central disc-shaped hub I2. This hub disc is spanned by an inverted U-shaped handle I4 and is perforated centrally as at I6 to receive therein the lower end of a sleeve I8. The opposite end of the sleeve I8 is fitted Within an opening 20 formed in the handle Il so that the holder may be mounted to rotate upon or with an anchor (not shown) during the winding or unwinding of the iilm.

The novelty in the present invention, among other features.. resides in the manner of constructing the radial arms for engaging, locating and holding the lower or inner edge portions of the several convolutions of the spiral web in that said arms consist of a plurality of sheet metal strips, eachhaving formed integral therewith a plurality of struck-up, substantially inverted, U- shaped reinforcing portions 22 spaced from one another by a plurality of vertical recesses 24 Within which the lower or inner edge portions 26 of the convolutions of the spiral web 28 are disposed in spaced relationship. As shown in Fig. 6, -the engaged inner edge portion of the several convolutions of the spiral are united in firm and rigid relationship with the radial arm after assembly by soldering, brazlng or` the like.

Thus it is not necessary to use extreme care in assembling the spiral upon the arms because the reinforcing portions 22 automatically locate the spiral convolutions in properly spaced relation to each other. Further, if soldering, brazing, welding or the like be employed as a means for holding the convolutions of the spiral in engagement with the radial arms, the reinforcing portions 22 hold the spiral in place during such operation. In addition the reinforcing portions, back up, support and brace the convolutions in a manner to materially increase the strength and rigidity of the structure as a whole.

In operation, one end of the film to be developed is secured to film holder as by wedging or otherwise between the inner convolutions of the spiral web and hub disc and bodily rotation is imparted to the film holder. By properly guiding the film against the face of the spiral the film is wound thereon. After the winding of the iilm` upon the holder has been completed, the holder is lifted by the handle I4 and placed upward in a shallow tank containing the developing fluid. After the developing of the film is completed the holder may be again lifted by the handle and placed in a fixing bath. and after fixing is completed it may be placed in a washing tank, it being apparent that it is possible to carry out all of the steps without touching the film itself and while the face of the film is maintained out of contact with any object which might tend to scratch or abrade it. Further, any part of the length of the film may be inspected from time to time without the necessity of removing the lil is immersed in the developing fluid at a time it follows that its development is uniform throughout.

While the elements shown and described are well adapted to serve the purposes for which they are intended, it is to be understood that the invention is not limited to the precise construction set forth, but that it includes within its purview whatever is new that comes within the spirit of the appended claims.

We claim:

l. A structure of the' character described comprising, a plurality of radial arms having a plurality of spaced struck-up reinforcing portions,

and a spirally arranged web secured to said radial arms. the convolutions of which are disposed in the spaces between adjacent reinforcing portions of said arms. Y

2. A structure of the character described comprising, a plurality of radial arms, a spirally arranged web secured to said radial arms, said arms having longitudinally-extending, reinforcing portions spaced one from the other by a plurality of recesses, within which are disposed the inner edge portions of the convolutions of said web. v

3. A structure of the character described comlprising, a plurality ot radial, substantially U- shaped arms, and a spirally arranged web secured to said radial arms, said arms being provided with a plurality of spaced recesses, within which are disposed the inner edge portions of the convolutions of said web.

4. A structure of the character described comprising, a centrally-disposed hub having an opening formed therein to mount the structure for rotation. a plurality of radially-arranged arms of inverted U-shape carried by said hub having a plurality of spaced slotted recesses disposed longitudinally along the upper edge of said arms, a spiralled web secured to said radial arms, the inner edge portions of the convolutions of which :2.073.644 entire fum :rum the tank. since au of the sim are disposed within the recesses of said radial arms.

5. A structure of the character described comprislng, a plurality of radial arms, a` spirallydisposed web secured to said radial arms, said arms having inclined walls formed with slots. within which the inner edge portions of said web are received.

6. A structure of the character described comprising, a plurality oi radial arms. a spirally disposed web secured to the radial arms, and a plurality of integral portions struck upwardly above the plane of the normal upper faces. of said armsarms, said web being secured between said upwardly struck portions.

8. In a device of the character described the combination with a spiral web, the convolutions of which lie' in spaced relation to each other, a radial arm underlying the convolutions of the web, and a plurality of guiding and holding elements struck upwardly'above the plane of the upper face of said arm and uniformly spaced therealong and constituting locating and supporting means for positioning and holding the web in proper place upon the arm, said web being pinched between said upwardly struck portions.

GEORGE A. MAGNUS. JOHN R. WHITACRE. 

